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Redis 统计每个数据类型中占用内存最多的前 N 个 bigkey

import redisdef find_bigkeys(host='localhost', port=6379, db=0, n=10):r = redis.Redis(host=host, port=port, db=0)bigkeys = {}# 用于存储每种数据类型的键及内存占用type_memory_dict = {}# 扫描所有键for key in r.scan_iter("*"):key_type = r.type(key).decode()memory_usage = r.memory_usage(key)if key_type not in type_memory_dict:type_memory_dict[key_type] = []type_memory_dict[key_type].append((key, memory_usage))# 找出每种数据类型中占用内存最多的前N个键for key_type, key_memory_list in type_memory_dict.items():key_memory_list.sort(key=lambda x: x[1], reverse=True)bigkeys[key_type] = key_memory_list[:n]return bigkeysif __name__ == "__main__":bigkeys = find_bigkeys()for key_type, bigkey_list in bigkeys.items():print(f"数据类型: {key_type}")for key, memory_usage in bigkey_list:print(f"键: {key}, 内存占用: {memory_usage} 字节")

#!/bin/bash# Redis 服务器地址和端口
REDIS_HOST="localhost"
REDIS_PORT=6379
# 要获取的每个数据类型的前 N 个 bigkey
N=10# 临时文件用于存储每个类型的键和内存使用情况
declare -A type_files# 扫描所有键
cursor=0
while true; doresult=$(redis-cli -h $REDIS_HOST -p $REDIS_PORT SCAN $cursor)cursor=$(echo $result | awk '{print $1}')keys=$(echo $result | awk '{$1=""; print $0}' | tr ' ' '\n')for key in $keys; dokey_type=$(redis-cli -h $REDIS_HOST -p $REDIS_PORT TYPE $key)memory_usage=$(redis-cli -h $REDIS_HOST -p $REDIS_PORT MEMORY USAGE $key)# 如果该类型的临时文件不存在，则创建if [ ! -f "${type_files[$key_type]}" ]; thentype_files[$key_type]="/tmp/redis_bigkeys_${key_type}.tmp"> "${type_files[$key_type]}"fi# 将键和内存使用情况写入临时文件echo "$key $memory_usage" >> "${type_files[$key_type]}"done# 扫描结束if [ $cursor -eq 0 ]; thenbreakfi
done# 处理每个类型的临时文件，找出前 N 个 bigkey
for key_type in "${!type_files[@]}"; dofile="${type_files[$key_type]}"echo "数据类型: $key_type"sort -k2 -nr $file | head -n $N | while read key memory; doecho "键: $key, 内存占用: $memory 字节"done# 删除临时文件rm $file
done